Wrap course structure generation task in bulk operation.

openedx/core/djangoapps/content/course_structures/tasks.py

@@ -13,6 +13,7 @@ def _generate_course_structure(course_key):
     """
     Generates a course structure dictionary for the specified course.
     """
+    with modulestore().bulk_operations(course_key):
         course = modulestore().get_course(course_key, depth=None)
         blocks_stack = [course]
         blocks_dict = {}
@@ -27,7 +28,8 @@ def _generate_course_structure(course_key):
                 "children": [unicode(child.scope_ids.usage_id) for child in children]
             }
 
-        # Retrieve these attributes separately so that we can fail gracefully if the block doesn't have the attribute.
+            # Retrieve these attributes separately so that we can fail gracefully
+            # if the block doesn't have the attribute.
             attrs = (('graded', False), ('format', None))
             for attr, default in attrs:
                 if hasattr(curr_block, attr):